Are 89mm DASA pistons the same as CR500?

S

Storbeck

Location
Minnesota
Anybody know? Or if not what the difference is?

They have a different Wiseco part number, so it looks like there is probably some difference but not sure if it's significant.
 
S

Storbeck

Location
Minnesota
Blue said:
Its been a while but i think they can be used but require some mods like cutting the skirts shorter. I know i have used CR500 pistons in several 89mm motors. But its been a while so im like 85% sure too. Maybe 86%. Lol.

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I know that the PHP 898 uses CR500 pistons with some sort of mod, I think trimming of the skirt, so you might be thinking of that (?) Wouldn't be surprising if the DASA is too. Looking at pictures the DASA pistons LOOK like the CR500's and the shape of the intake side of the skirt is (I think) not what you would do if you were designing a custom piston for a watercraft motor, which makes me think they are the same or slightly modified, but was hoping to confirm.
 
Blue

Blue

Judging your cheapness
Location
St Cloud Florida
Storbeck said:
@Blue thank you for the response by the way.
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Sorry i couldnt be more help. You may be right about the php 898. I know the blowsion super bore will take cr500 pistons as i used them in mine years ago. I think the dasa does too. One time years back i was rebuilding one and the pistons hit the crank and had to be modified so that makes me think there just cr500 pistons they just mod for the dasa. Maybe buy a used cr500 piston on ebay to compare or buy one on amazon to compare and return it.

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cpolaris502

cpolaris502

Location
Minnesota
My friend put out-of-the-box CR500 pistons in his 950 earlier this year. The only modification that had to be done was recutting the domes. Side by side, the only real noticeable difference was the crown of the Dasa piston being machined down. He's got over 20 hrs on it now.
 
S

Storbeck

Location
Minnesota
cpolaris502 said:
My friend put out-of-the-box CR500 pistons in his 950 earlier this year. The only modification that had to be done was recutting the domes. Side by side, the only real noticeable difference was the crown of the Dasa piston being machined down. He's got over 20 hrs on it now.
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So the DASA pistons had a flatter dome? Cutting the squish band is no big deal but that would mean more compression unless the rest of the chamber was cut bigger.
 
cpolaris502

cpolaris502

Location
Minnesota
Storbeck said:
So the DASA pistons had a flatter dome? Cutting the squish band is no big deal but that would mean more compression unless the rest of the chamber was cut bigger.
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The Dasas were cut like a cone, with a point.

I believe the entire contour of the head's domes were cut to try and keep the same volume.
 
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